Airtac BSAI Locking Clamp Cylinder BSAI125X700S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X700S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 700mm stroke and a spring-applied, air-released clamp-lock that holds the rod at ANY position along its travel — with a static holding force of 8600 N.
- BoreØ125 mm
- Stroke700 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X700S
The AirTAC BSAI125X700-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. A defining advantage over stroke-end-only variants is that this enclasp gripper clamps the carbon steel piston rod at ANY position along its 700 mm travel, delivering a static holding force of 8600 N. Because it includes a magnet (-S), it integrates seamlessly with AirTAC CMSE reed and DMSE solid-state sensors for precise position verification.
It is crucial to distinguish this 8600 N holding force from the cylinder's standard thrust, which reaches 6136 N at 0.5 MPa (8590 N at the 0.7 MPa maximum). The clamp holds the static load independently of pneumatic thrust, but the variable air cushions at the stroke ends only decelerate the moving piston; they do not secure the load. The clamp operates via a dedicated G1/8 enclasp port, requiring 0.15-0.7 MPa to release, and locks only after the rod has come to a complete stop.
Airtac BSAI Locking Clamp Cylinder BSAI125X700S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X700S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 700 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/2 |
| Rod thread | M27×2 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 8600 N |
| Enclasp / unlock port | G1/8 |
| Operating pressure | 0.15 – 0.7 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Max stroke | Up to 1000 mm |
Specifications follow the official AirTAC BSAI datasheet (ISO 15552). Operating pressure is 0.15–0.7 MPa (lower than a plain SAI). Port options: PT / G.
How the Clamp-Lock Holds
static holding force (Ø125 mm)
A spring-applied gripper clamps the rod and holds the load at any position in the stroke — not just at the stroke end (that is a SAIL) — and it is bidirectional: it holds whether the rod was extending or retracting.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa (max) | 8590 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (8600 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI125X700S Is Used
Vertical Load Holding
Secures heavy vertical actuators at any intermediate height during power loss, utilizing the 8600 N clamp to prevent gravity-driven drops.
Machining Position Lock
Freezes the 125 mm rod at a specific travel point to withstand cutting forces or heavy workpiece loading without relying on live air pressure.
Mid-Stroke Safety Stop
Holds the load safely anywhere along the 700 mm travel during emergency stops, acting as a reliable static brake once motion ceases.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X700S the Right Clamp-Lock?
Select this 125 mm bore model when an application demands exceptional mid-stroke positioning and heavy-load holding that smaller bores cannot match. If your load requires less force, stepping down to the 100 mm bore offers 3927 N thrust at 0.5 MPa and a 5500 N holding capacity, but this BSAI125X700-S provides the maximum holding power available in the series. Choose this clamp-lock version over a plain SAI cylinder when power loss could cause the load to drop or drift, and over a SAIL cylinder when you must hold securely at intermediate positions rather than just at the stroke ends.
When replacing or specifying this unit, verify you need a single-rod configuration with a 700 mm stroke, PT tapered port threads (1/2 inch cylinder ports plus the G1/8 unlock port), and the -S magnet option. The mounting interface accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 brackets. Because the stroke is 700 mm, the M27x2 rod thread provides substantial side-load capacity, but an external guide is still strongly recommended for such a long, unsupported travel to prevent undue wear on the enclasp mechanism.
Quick checklist
- ✓ Hold needed at any position?
- ✓ Or stroke-end only → use SAIL
- ✓ Holding force ≥ your load
- ✓ Balanced-pressure unlock circuit
- ✓ Extra safety measure for people
Airtac BSAI Locking Clamp Cylinder BSAI125X700S FAQ
The clamp-lock provides a static holding force of 8600 N. It uses a spring-applied, air-released mechanism to grip the rod bidirectionally at any position along the stroke, holding the load securely even when air pressure is removed.
The clamp unlocks only after applying 0.15-0.7 MPa to the G1/8 enclasp port AND balancing the air pressures on both sides of the piston. If pressures are not balanced, the rod can jump abruptly upon release. It also only locks after the rod has stopped; it cannot brake a moving load.
Related AirTAC Lock & Standard Cylinders
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